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Security Capacity by Nonlinear Transmission in MIMO Systems for Physical Layer Security

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Abstract

To enhance the information security in multiple input multiple output (MIMO) wireless communication systems, nonlinear transmission is studied in this paper by pushing the power amplifier (PA) at the transmitter to operate in the nonlinear region, even near to the saturate point. Linearization reception technique is then adopted at the legal user’s receiver to remove the distortion caused by the nonlinear PA, so that the distortion-free signal can be drawn, and correct demodulation and decoding could be achieved. While for the eavesdroppers, the information required to complete the nonlinear reception could hardly be obtained, since the critical training sequence is designed to be invisible to the eavesdrop** users, so the security transmission between the legitimate users can be obtained. Then, the security capacity by nonlinear transmission is analyzed in the MIMO–OFDM systems, where the signal to distortion plus noise ratio is derived, and the upper approximation is also presented. Numerical simulations are carried out to verify the effectiveness of the proposed scheme with practical reception algorithm, and it is shown that obvious security capacity can be acquired with both memory and memoryless PAs.

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Data Availability

Data generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code Availability

Data generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The work was supported in part by the Natural Science Foundation of Shannxi Province under Grant 2019JM-532, and in part by the Major Scientific and Technological Innovation Project of Shandong Province of China (2020CXGC010705, 2021ZLGX05, 2022ZLGX04).

Funding

Natural Science Foundation of Shannxi Province, 2019JM-532, jieling wang,Major Scientific and Technological Innovation Project of Shandong Province, 2020CXGC010705, jieling wang, 2021ZLGX05, jieling wang, 2022ZLGX04, jieling wang

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Authors and Affiliations

  1. School of Telecommunications Engineering, State Key Laboratory of Integrated Services Network, **dian University, **’an, 710071, Shannxi, China

    Menghan Li, Jieling Wang & Ba-Zhong Shen

  2. China Academy of Space Technology, Bei**g, 100072, China

    Yejun Zhou

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  1. Menghan Li
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  4. Yejun Zhou
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Contributions

Menghan Li: Conceptualization, Methodology, Software, Data curation, Writing—original draft. Jieling Wang: Validation, Formal analysis, Writing—original draft, review and editing, Supervision, Project administration. Ba-Zhong Shen: Conceptualization, Formal analysis. Yejun Zhou: Methodology, Formal analysis.

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Correspondence to Jieling Wang.

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Li, M., Wang, J., Shen, BZ. et al. Security Capacity by Nonlinear Transmission in MIMO Systems for Physical Layer Security. Wireless Pers Commun (2024). https://doi.org/10.1007/s11277-024-11437-0

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